Introduction
⚡️ use.ink helps you easily build safe, efficient smart contracts for Polkadot and Substrate-based blockchains.
🚀 Write smart contracts in ink!, a domain-specific language built on top of Rust — combining safety, performance, and scalability.
🛠 Use familiar Rust tooling like clippy, cargo, crates from crates.io, and popular IDEs for a seamless development experience.
🤝 Interoperability with Solidity: Solidity developers can call ink! contracts just like other Solidity contracts, enabling cross-ecosystem collaboration.
🌎 Deploy ink! smart contracts on blockchains built with the Polkadot SDK. Check supported chains here.
ink! v6 is no longer using WebAssembly and pallet-contracts!
Instead we migrated to RISC-V, PolkaVM, and pallet-revive.
Read more about the transition here.
Fast Track
Install Rust and cargo: Installation Guide.
Download the binary for a local development node here.
# Install our cli tool.
# It wraps around `cargo build` to build contracts with optimal
# flags for blockchains. It also allows for deploying + interacting
# with contracts.
$ rustup component add rust-src
$ cargo install --locked --force --git https://github.com/use-ink/cargo-contract
# Create a simple contract.
$ cargo contract new flipper && cd flipper
$ cargo contract build --release
# Start your local development node in a separate shell session
$ chmod +x ink-node (makes the node's binary executable)
$ ink-node (starts the node, try `./ink-node` if the previous command doesn't work)
# Instantiate this contract on-chain.
$ cargo contract instantiate --suri //Alice --args true -x
# Dry-run a call of it.
$ cargo contract call --suri //Alice --contract 0x… --message get
# Execute a contract call, as a transaction on-chain.
$ cargo contract call --suri //Alice --contract 0x… --message flip -x
Smart Contract Examples
Our "Hello, World!".
» view example
An ERC-20 implementation.
» view example
An upgradeable contract.
» view example
A multi-signature wallet.
» view example
Allow runtime access.
» view example